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2.4 Valve Adjustment Knob (VAK)
2.4.1 LEGEND LX GLACIA Regulator
The VAK, located opposite of the hose connection on certain model second
stages, adjusts the effort required to start the air flow at the beginning of the
the second stage, such as strong currents or while using a diver propulsion
vehicle (DPV). It will also allow compensation for a difference in the hydrostatic
pressure and the centre of your lungs, such as when you are in a head-down
position. You can use the VAK to tune your regulator to maintain its peak per-
formance throughout the course of your dive, or you can leave it set in its mid-
range position and dive with as you would any non-adjustable second stage.
2.4.2. Kronos Second Stage Adjustment: „Dual Cam‰.
The Dual Cam patented adjustment system combines both the VAS and the
VAK.
2.4.3 Mikron Regulator
The VAK, located opposite of the hose connection on certain model second stages,
adjusts the effort required to start the air flow at the beginning of the inhalation
cycle. As it is turned "in" (clockwise), the opening effort will increase. This will make
compensation for a difference in the hydrostatic pressure and the centre of your
lungs, such as when you are in a head-down position. You can use the VAK to tune
your regulator to maintain its peak performance throughout the course of your
dive, or you can leave it set in its mid-range position and dive with as you would any
non-adjustable second stage.
When the VAK is completely unscrewed (counter-clockwise), the regulator will pro-
vide maximum performances. When the VAK is completely screwed (clockwise),
breathing resistance is increased.
10
B a c k t o t h e c o n t e n t s
inhalation cycle. As it is turned "in" (clockwise), the ope-
ning effort will increase. This will make the second stage
less sensitive to sudden changes in ambient pressure.
Turning the knob "out" (counter-clockwise) will decrease
the opening effort to make breathing easier.
This adjustment is particularly useful at deeper depths,
or in variable conditions that affect the opening effort of
In the "+" position: the VAS is maximum and the VAK is
minimum (turned out). This gives optimum performance
(average: 1.2j/l according EN 250).
In the "-" position: the VAS is minimum and the VAK is
maximum (turned in). This reduces performance to the
maximum allowed by EN 250 (average: 2.8j/l). This
offers a very effective pre-dive position.
the second stage less sensitive to sudden changes in
ambient pressure. Turning the knob "out" (counter-clock-
wise) will decrease the opening effort to make breathing
easier. This adjustment is particularly useful at deeper
depths, or in variable conditions that affect the opening
effort of the second stage, such as strong currents or
while using a diver propulsion vehicle (DPV). It will also allow
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